(cobra to statsd bot) add ability to extract a numerical value and send a gauge event to statsd

docs/CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 All changes to this project will be documented in this file.
 
+## [9.1.7] - 2020-03-29
+
+(cobra to statsd bot) add ability to extract a numerical value and send a gauge event to statsd
+
 ## [9.1.6] - 2020-03-29
 
 (ws cobra subscriber) use a Json::StreamWriter to write to std::cout, and save one std::string allocation for each message printed

ixbots/ixbots/IXCobraToStatsdBot.cpp

@@ -40,7 +40,7 @@ namespace ix
     // Extract an attribute from a Json Value.
     // extractAttr("foo.bar", {"foo": {"bar": "baz"}}) => baz
     //
-    std::string extractAttr(const std::string& attr, const Json::Value& jsonValue)
+    Json::Value extractAttr(const std::string& attr, const Json::Value& jsonValue)
     {
         // Split by .
         std::string token;
@@ -53,7 +53,7 @@ namespace ix
             val = val[token];
         }
 
-        return val.asString();
+        return val;
     }
 
     int cobra_to_statsd_bot(const ix::CobraConfig& config,
@@ -62,6 +62,7 @@ namespace ix
                             const std::string& position,
                             StatsdClient& statsdClient,
                             const std::string& fields,
+                            const std::string& gauge,
                             bool verbose,
                             size_t maxQueueSize,
                             bool enableHeartbeat,
@@ -124,7 +125,7 @@ namespace ix
 
         std::thread t2(heartbeat);
 
-        auto statsdSender = [&statsdClient, &queueManager, &sentCount, &tokens, &stop] {
+        auto statsdSender = [&statsdClient, &queueManager, &sentCount, &tokens, &stop, &gauge, &fatalCobraError] {
             while (true)
             {
                 Json::Value msg = queueManager.pop();
@@ -136,10 +137,51 @@ namespace ix
                 for (auto&& attr : tokens)
                 {
                     id += ".";
-                    id += extractAttr(attr, msg);
+                    auto val = extractAttr(attr, msg);
+                    id += val.asString();
                 }
 
+                if (gauge.empty())
+                {
                     statsdClient.count(id, 1);
+                }
+                else
+                {
+                    // spdlog::info("{} - {} -> {}", id, gauge, x);
+                    auto val = extractAttr(gauge, msg);
+
+                    if (val.isInt())
+                    {
+                        auto x = val.asInt();
+                        statsdClient.gauge(id, (size_t) x);
+                    }
+                    else if (val.isInt64())
+                    {
+                        auto x = val.asInt64();
+                        statsdClient.gauge(id, (size_t) x);
+                    }
+                    else if (val.isUInt())
+                    {
+                        auto x = val.asUInt();
+                        statsdClient.gauge(id, (size_t) x);
+                    }
+                    else if (val.isUInt64())
+                    {
+                        auto x = val.asUInt64();
+                        statsdClient.gauge(id, (size_t) x);
+                    }
+                    else if (val.isDouble())
+                    {
+                        auto x = val.asUInt64();
+                        statsdClient.gauge(id, (size_t) x);
+                    }
+                    else
+                    {
+                        spdlog::error("Gauge {} is not a numberic type", gauge);
+                        fatalCobraError = true;
+                    }
+                }
+
                 sentCount += 1;
             }
         };

ixbots/ixbots/IXCobraToStatsdBot.h

@@ -18,6 +18,7 @@ namespace ix
                             const std::string& position,
                             StatsdClient& statsdClient,
                             const std::string& fields,
+                            const std::string& gauge,
                             bool verbose,
                             size_t maxQueueSize,
                             bool enableHeartbeat,

ixwebsocket/IXWebSocketVersion.h

@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "9.1.6"
+#define IX_WEBSOCKET_VERSION "9.1.7"

test/IXCobraToStatsdBotTest.cpp

@@ -111,6 +111,7 @@ TEST_CASE("Cobra_to_statsd_bot", "[cobra_bots]")
         REQUIRE(initialized);
 
         std::string fields("device.game\ndevice.os_name");
+        std::string gauge;
 
         int sentCount = ix::cobra_to_statsd_bot(config,
                                                 channel,
@@ -118,6 +119,7 @@ TEST_CASE("Cobra_to_statsd_bot", "[cobra_bots]")
                                                 position,
                                                 statsdClient,
                                                 fields,
+                                                gauge,
                                                 verbose,
                                                 maxQueueSize,
                                                 enableHeartbeat,

ws/ws.cpp

@@ -70,6 +70,7 @@ int main(int argc, char** argv)
     std::string password;
     std::string prefix("ws.test.v0");
     std::string fields;
+    std::string gauge;
     std::string dsn;
     std::string redisHosts("127.0.0.1");
     std::string redisPassword;
@@ -264,6 +265,7 @@ int main(int argc, char** argv)
     cobra2statsd->add_option("--port", statsdPort, "Statsd port");
     cobra2statsd->add_option("--prefix", prefix, "Statsd prefix");
     cobra2statsd->add_option("--fields", fields, "Extract fields for naming the event")->join();
+    cobra2statsd->add_option("--gauge", gauge, "Value to extract, and use as a statsd gauge")->join();
     cobra2statsd->add_option("channel", channel, "Channel")->required();
     cobra2statsd->add_flag("-v", verbose, "Verbose");
     cobra2statsd->add_option("--pidfile", pidfile, "Pid file");
@@ -463,6 +465,7 @@ int main(int argc, char** argv)
                                       position,
                                       statsdClient,
                                       fields,
+                                      gauge,
                                       verbose,
                                       maxQueueSize,
                                       enableHeartbeat,